Safety tire-valve.



E. J. RYAN.

SAFETY TIRE VALVE.

APPLICATION FILED 13512.22, I9I4.

Patnted June 20, 1916.

I I 1 Il AA! AM Imm lELlllUER 1T RY, UF LONG BEACH, CALIFOlEtlilIllA,AASSIGNOR 0F UNE-HALF T0 JPRUDENCE 1W. WELSH ONE-TWENTDETJEI T0 lltlllml'H. DAJRJBY,

CALIFOR.

BOTH 0F LONG BEACH,

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Specification of Letters Ratent.

Patented l une 2d, 19116..

To all whom t may concern:

lBe it known that l, FLMER J. RYAN, a

citizen of the United States, residing at Long Beach, in the county ofLos Angeles and State of California, have invented a.

new and useful Safety Tire-Valve, of which the following is aspecification.

This invention relates to a Isafety tire valve, and more particularlytoV an auxiliary valve to be attached to the ordinary tire valve.

Oneof the objects of this invention is to provide a device lwhich willoperate to rel which often causes a blow-out and .my invention aims. toprovide a device which will lte controlled by a valve 2, which is openedagainst the action of the spring 3 by an- All) llt

never permit the pressure to go'over a predetermined degree.

Another object is to provide a very simple and practical auxiliary valvefor this purpose which may be attached to the universal tire valvecasing without any modifications thereof.

With these and other objects in view, the

invention consists ofl certain novel features of construction,combination and arrangement of parts as will be hereinafter fullydescribed, illustrated and claimed.

Figured is a longitudinal sectional view through my safetyvalve,"showing the\same attached to a tire valve. Fig. 24de alongitudinal sectional View, showingv the auxiliary safety. valve opento permit an escape of air from a tire. Fig. 3 is. a, detail perspectiveview of the valve seat of the safety valve. Fig. 4 is a perspective viewof the valve casing member or valve proper.

Referring in detail to the drawings by numerals, 1 designates anordinary tire valve casing, the passage through which is inward movementofthe stem 4. 1n place of the cap which is usually screwed onto thethreaded reduced end portion 5 of the tire valve casing 1, after a tirehas been inflated, l employ a safety device comprising a hollowcylindrical casing 6 having an interior chamber 7 which is threadedadjacent its outer end, as indicated at 8, and which is in communicationat its inner end with a bore or passage 9 opening upon the upper end ofthe casin A seat 10 is threaded into the chamber and is formed with acentral opening 11, the inner end of which is flared outwardly to form avalve'seat 12. 'The valve 13 is preferably cylindrical, having a bodyportion 14, which is conically shaped adjacent one end to conform withthe seat 12. A stem 15 projects longitudinally from the conically shapedend of the valve through the port 11 of the valve seat, and is slightlyenlarged on its free terminal as indicated at 16, and this enlargementis provided with an end opening recess 17 to receive the projecting endof the tire valve stem 4. A lug or boss 18 is formed on the upper end ofthe valve 13, and is encircled by an expansive helical spring 19, whichbears at one end against the valve and at its other end against theupper end of the chamber 7.

1n assembling the auxiliary safety device the seat is first placed inthe chamber 7, .then'the valve is positioned and finally the seat isscrewed into place, and the pressure at which the valve will open may beregulated by adjusting the position of the seat.

'lhe farther in the seat is screwed, the tighter the spring 19 iscompressed, therefore the greater the pressure which will be requiredftounseat the valve.

After a tire has been inflated the proper amount, my auxiliary safety`device is screwed onto the end of the tire valve casing 1so theenlargedend of the stem 15 will engage the end of the tire valve stem 4and force the same inwardly to unseat the tire valve 2. The spring 19 issomewhat stronger than the spring 3, and therefore the valve v"14 willnot necessarily unseat whenthe valve 2 is unseated in the manner justdescribed. Now should the pressure within the tire increase beyond acertain prede- `and allow enough of the air to escape to again reducethe-tire pressure to normal. By adjusting the seat 10 so as to bring itnearer tothe inner end of the casing 6 the valve 13 is allowed to movecorrespondingly and this brings the stem '15 on the valve v13 nearer tothe inner end of the casing 6 also and causes the tire valve 2 to bemoved -termined amount, the valve 14 will unseat nearly into closedposition. By this arrangement the valve 2 may be held only slightly open.and this` prevents the escapement of large quantities of air when thetires encounter bumps in the road beds and at the some timepermitssuicient escapement of air to prevent blowouts.

From the foregoing description taken in connection with the accompanyingdrawings, itl will be apparent that I have provided a very simple andpractical auxiliary safety valve, which will prevent tire blow-outs andwhich may be adjusted to operate when the desired pressure is exceeded.

What I claim is:

1. Thecombination With a tire valve,of a safety device lcomprising acasing having internal screw threads and a passage through the outer endcommunicating with .the atmosphere, a longitudinally adjustable valve jseat mounted Within the casing and having an opening formedtherethrough, a valve mounted upon said seat, spring means for normallyholding said valvein closed position, and av stem carried by4 the valve,projecting through the opening in the seat and engaging the stem of thetire valve whereby the tire valve is held open.'

2. Thev combination with a tire valve including a stem and a casing, ofa safety device comprising an internally screwthreaded casing having apassage formed through its outer end and communicating with `theatmosphere, said casing being connected With the valve casing, ascrewthreaded seat member ymounted Within the casing and beingadjustable longitudinally thereof, a valve mounted upon said seat,spring means for normally holding said valve against the seat, and astem carried by the valve, projecting through the seat and engaging thestem of the tire valve whereby said tire valve is held open.

In testimony whereof, I have hereunto set my hand at Los Angeles,California this 11th day of December, 1914.

ELBIER J. RYAN. In presence of RODNEY M. SMITH, M. H. DARBY.

